The nonlinear dynamics of an actuator are considered during the output feedback control design a quarter-car active suspension system with uncertainties. Because complexity hydraulic dynamics, simple and effective sliding-mode strategy is employed to obtain both controller observer. Instead dividing into subsystem subsystem, repartitioned linear which facilitates greatly. By specifying suitable sliding functions for two subsystems respectively, forcing track desired fictitious input created....

This paper presents an original adaptive sliding mode control strategy for a class of nonlinear systems on the basis uncertainty and disturbance estimator. The can be with parametric uncertainties as well unmatched external disturbances. novel has several advantages over traditional method. Firstly, discontinuous sign function does not exist in proposed controller, it is replaced by saturation or similar approximation functions well. Therefore, chattering avoided essence, avoidance at cost...

Abstract In the process of Wavelet Analysis, only low-frequency signals are re-decomposed, and high-frequency no longer decomposed, resulting in a decrease frequency resolution with increasing frequency. Therefore, this paper, firstly, Packet Decomposition is used for feature extraction vibration signals, which makes up shortcomings Analysis extracting fault features nonlinear different energy values bands obtained by Decomposition. The visualized K-Means clustering method, results show that...

The dynamic model is significant for the analysis of vibrational characteristics wheeled tractor system with implement and front axle hydropneumatic suspension. In this work, nonlinear stiffness damping equations are derived first. coupling relationship among cabin, three‐point hitch structure, figured out, half agricultural tractor/implement presented considering effects passive silent blocks suspension together. To validate model, power spectral densities (PSDs) driver seat, chassis,...

When the submarine is sailing at full speed, power cabin has an abnormally high temperature. However, in previous research on vibration reduction design of foundation, influence temperature characteristics foundation not taken into account. In this paper, a new composite with entangled metallic wire material (EMWM) presented to reduce foundation. The energy transfer path was obtained by flow method, and then layout EMWM determined. optimization constraining layer carried out modal analysis....

Considering the time-delay in control input channel and nonlinear spring stiffness characteristics of suspension, a quarter-vehicle magneto rheological active suspension model with is established this paper. Based on model, an adaptive neural network structure for presented. By recognizing training network, controller obtained. Simulation results show that presented method can guarantee system has satisfying performance E_level very poor ground.

A nonlinear controller design method is proposed for active surge control of compression system. Close-coupled valve (CCV) used to modify the characteristic compressor, and allows stable operation beyond original line. The constructed on uncertainty disturbance estimator (UDE) approach. algorithm provides excellent stabilization rejection performance. Simulations are given show effectiveness method.

This manuscript describes a method to detect commercial complex change using Global Recruitment Service provided novel VHR images (N-VHR) and two dimensional wavelet transform. The proposed strategy combines differential vector image fuzzy principles. Utilizing corresponding data from transform log proportion image, new is formed. A grouping computation arranges the changed unaltered locales combined image. To redesign diminish impact of spot noise, adapts information about spatial setting...

Medium and small-scale high-clearance sprayers are widely applied in medium farms. Owing to power load limitations, it is difficult manage the complex system for suppressing spray boom vibration. This study was conducted design a boom-air suspension suitable small-size by combining vibration suppression characteristics of air spring charging/discharging. Thus, this aims address non-homogeneous distribution triggered vibrations small sprayers. The effects different elastic elements on effect...

How to further reduce vibration and noise is a major challenge for modern ship design. High‐temperature environment will significantly influence the mechanical properties (such as elastic modulus stiffness) of ship’s foundation. These have serious impact on inherent characteristics In this paper, simplified foundation taken research object, thermal‐vibration joint test system developed investigating thermal modal under different temperatures. The consists transient aerodynamic heating...

This paper presented a sliding mode controller based on PID reaching law for turboshaft engine with variable inlet guide vane. After analyzing the physical model and mathematical of compressor elaborately, component-level is obtained. In order to facilitate control system design, small deviation linear achieved model. Taking unavoidable uncertainties into consideration, method used construct basis law. Simulation results validate effect proposed modeling design method.